https://scholars.lib.ntu.edu.tw/handle/123456789/626614
標題: | Benzimidazole-substituted bisanthracene: a highly efficient deep-blue triplet-triplet fusion OLED emitter at low dopant concentration | 作者: | Chen, CH Hsiao, ZC Fan, BA Hou, LJ Lin, JH Lin, BY Liu, KT Huang, YR Zhang, Y Dzeng, YC Chiu, TL JIUN-HAW LEE Tan, J Chen, C MAN-KIT LEUNG |
關鍵字: | Triplet-triplet fusion (TTF); Fluorescence; Organic light emitting diode (OLED); Time-resolved electroluminescence (TrEL); ACTIVATED DELAYED FLUORESCENCE; EXTERNAL QUANTUM EFFICIENCY; MOLECULAR DESIGN; UP-CONVERSION; ANTHRACENE-DERIVATIVES; EXCITON DIFFUSION; DIODES; ANNIHILATION; TRANSPORT; EMISSION | 公開日期: | 2022 | 出版社: | ELSEVIER SCI LTD | 卷: | 26 | 來源出版物: | MATERIALS TODAY CHEMISTRY | 摘要: | Two anthracene derivatives, MAnBz and DiAnBz, have been developed as emitters for deep-blue triplet–triplet fusion (TTF) fluorescence organic light emitting diodes (OLEDs). DiAnBz bearing two anthracene units at a closed distance, separated by one phenylene moiety, shows high photoluminescent quantum yields and deep-blue emission. The remarkable maximum external quantum efficiency (EQEmax) of 6.7% and 8.3% are obtained from DiAnBz-OLEDs with pristine prompt fluorescence and TTF fluorescence models, respectively. In particular, effectively diffusive TTF characteristics still can be detected at DiAnBz-OLED with an extreme low emitter concentration of 1 wt%, whose device performance exhibited a high EQEmax of 7.0% with deep blue emission at CIE (0.148, 0.078). The diffusive TTF characteristics with 20 times shorter delayed emission lifetime (τ2 of 3–4 μs), in comparison with that of MAnBz (τ2 of 60–70 μs) in the time-resolved electroluminescence experiments. This implies that pairing and TTF of the DiAnBz triplet excitons are more effective than that of MAnBz in the light emitting layer. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626614 | ISSN: | 2468-5194 | DOI: | 10.1016/j.mtchem.2022.101185 |
顯示於: | 化學系 |
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